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Fixed undo/redo bug

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This commit is contained in:
juliandescottes 2012-09-08 16:50:29 +02:00
parent c16eba0eb9
commit 6bf1c773c8
1 changed files with 27 additions and 9 deletions
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36
js/model/Frame.js
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@ -3,7 +3,7 @@
ns.Frame = function (pixels) {
this.pixels = pixels;
this.previousStates = [this._clonePixels()];
this.previousStates = [this.getPixels()];
this.stateIndex = 0;
};
@ -27,12 +27,30 @@
return new ns.Frame(this._clonePixels());
};
ns.Frame.prototype._clonePixels = function () {
var pixels = [];
for (var col = 0 ; col < this.getWidth() ; col++) {
pixels[col] = this.pixels[col].slice(0 , this.getHeight());
/**
* Returns a copy of the pixels used by the frame
*/
ns.Frame.prototype.getPixels = function () {
return this.clonePixels_(this.pixels)
};
/**
* Copies the passed pixels into the frame.
*/
ns.Frame.prototype.setPixels = function (pixels) {
this.pixels = this.clonePixels_(pixels);
};
/**
* Clone a set of pixels. Should be static utility method
* @private
*/
ns.Frame.prototype.clonePixels_ = function (pixels) {
var clonedPixels = [];
for (var col = 0 ; col < pixels.length ; col++) {
clonedPixels[col] = pixels[col].slice(0 , this.getHeight());
}
return pixels;
return clonedPixels;
};
ns.Frame.prototype.serialize = function () {
@ -63,7 +81,7 @@
// remove all states past current state
this.previousStates.length = this.stateIndex + 1;
// push new state
this.previousStates.push(this._clonePixels());
this.previousStates.push(this.getPixels());
// set the stateIndex to latest saved state
this.stateIndex = this.previousStates.length - 1;
};
@ -71,14 +89,14 @@
ns.Frame.prototype.loadPreviousState = function () {
if (this.stateIndex > 0) {
this.stateIndex--;
this.pixels = this.previousStates[this.stateIndex];
this.setPixels(this.previousStates[this.stateIndex]);
}
};
ns.Frame.prototype.loadNextState = function () {
if (this.stateIndex < this.previousStates.length - 1) {
this.stateIndex++;
this.pixels = this.previousStates[this.stateIndex];
this.setPixels(this.previousStates[this.stateIndex]);
}
};
})();